Browse Prior Art Database

Power Backup for Stackable System

IP.com Disclosure Number: IPCOM000116984D
Original Publication Date: 1995-Dec-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 4 page(s) / 88K

Publishing Venue

IBM

Related People

Aureglia, JJ: AUTHOR [+5]

Abstract

The context is a System made of several stackable boxes, or stack elements. Each stack element has external connections to workstations and the purpose of the System is to provide workstation switching, in other words, allowing any workstation from any stack element to establish/release switched connections with any other workstation from the same or different stack element. To do so, all stack elements are linked together by a Switching Fabric.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Power Backup for Stackable System

      The context is a System made of several stackable boxes, or
stack elements.  Each stack element has external connections to
workstations and the purpose of the System is to provide workstation
switching, in other words, allowing any workstation from any stack
element to establish/release switched connections with any other
workstation from the same or different stack element.  To do so,
all stack elements are linked together by a Switching Fabric.

      Each stack element has one power block, one element of the
Switching Fabric (the Switching Fabric being distributed among the
different stack elements), and one or two I/O adapter cards.  In
addition, a special microprocessor card should be included in any
stack element to run the software supporting the switched connections
establishment/release.

      In a normal configuration, as shown Fig. 2, if the power
block of any stack element fails, the corresponding logic of the
distributed Switching Fabric also fails and therefore the whole
Switching Fabric and the whole Switching System break.

      Even more awkward, if any stack element has to be powered-off
for any maintenance/upgrade intervention, again the whole Switching
System will have to be shutdown.

      The purpose of this disclosure is to provide a solution to keep
the Switching Fabric powered on as long as, at least, one of the
stack elements is powered on, thus allowing failures or power off
condition of one or more stack elements in the Switching S...